Commerce extra panes allows you to expose nodes in the checkout phase. This way you can display important information inside the checkout panes in a given checkout page but it also provides a Terms of Service submodule to expose a checkbox below the node content in order to force the customer to accept the terms and conditions of the purchase before proceeding.
The official URL for this screencast is commerceguys.com/blog/commerce-module-tuesday-commerce-extra-panes, and that's the best place to comment.
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